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Why does Philae have only three legs?The harpoon system is somehow clear to me: "inject the harpoon wherever it finds ground and appropriate conditions" - but how does this ominous thruster system work?

Why does Philae have only three legs?@David: But now one of the three legs rises helplessly into the air. Wouldn't it be better that a fourth leg touches ground? In any case? (Left alone of what you explained - which I hope to have understood.)

Why does Philae have only three legs?We are not talking about something like a plane underground with strong gravitational effects - but about an unpredictabily irregular underground with some soft gravitational effects.

Nov13

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Why does Philae have only three legs?We are not talking about something like a plane underground with strong gravitational effects - but about an unpredictabily irregular underground with some soft gravitational effects.